Internet, virtualization, cloud.

What’s a distributed information system?

Geographically distributed, physical servers, sharing only part of the computing resources or peripherals.

What’s a data centre?

Large number od servers and storage capacities in one location, server virtualization, easier management

What’s virtualization?

Software abstraction of hardware resources (processors, memory, disk arrays and network) and their dynamic allocation to real resources.

What’s virtualization of the entire server?

hypervisor, server emulation, full-fledged logical server (virtual processor, memory, peripherals, own OS)

What’s containerization?

single OS, containerization software (virtual os kernel), isolated package with all dependencies for running the application (libraries, environment, configurations, files)

What’s cloud computing?

The provision of shared computing facilities and their use as a service. Delivering various services over the internet: storage, processing power and applications, scalability, accessibility.

Cloud - deployment models?

Public cloud, private cloud, community cloud, hybrid cloud

Whats public cloud?

The cloud infrastructure is avilable to the general public.

Whats private cloud?

The cloud infrastracture is used exlusively by a single client or organisation

Whats community cloud?

The cloud jnfrastracture is shared by multiple clients/organisations with skmilar service requirements

Whats hybrid cloud?

A combination of public and community cloud

What are the cloud service models examples

Saas (Software-as-a-Service), PaaS (Platform as Service) IaaS (infrastracture as service), BaaS (Backup as Service), Maas (monitoring as service), CaaS (commjnication as service)

Whats SaaS

webmail, office tools, games, google apps, office365

Whats PaaS

runtime environment, webservers, DB, MS WinAzure, INM cloud foundry, etc.

Whats IaaS

virtual machines, servers, storage, networks, amazon ec2 network etc.

Whats BaaS

data backup and eventual restoration using the providers infrastracture

Whats MaaS

monitoring and evaluating the status of customer networks, applications, servers, data and other elements deployed in the cloud

Whats CaaS

providing the communication needs of the user or company as part of the SaaS model

Definition of internet

the largest network in the world, using TCP/IP protocols and a packet switching mechanism and running on any infrastracture. Internet = several networks interconnected, internet = term describing worldwide network

The idea of internet data transfer

The concept of divided responsibility. AS - autonomous system, unified admjnistration, indeoendent of the surrounding AS; ISP - internet service provider

Internet topology

IXP (internet exchange point, peering center), Tier 1 ISPs (cover the entire planet, routers must contain information about all networks; Tier 2 ISPs (cover a continent, provide connectivity for local ISPs; Tier 3 ISPs (cover countries, connect end users)

whats NIX

Neutral Internet Exchange - neutral hardware platform for network interconnection